1CEY

ASSIGNMENTS, SECONDARY STRUCTURE, GLOBAL FOLD, AND DYNAMICS OF CHEMOTAXIS Y PROTEIN USING THREE-AND FOUR-DIMENSIONAL HETERONUCLEAR (13C,15N) NMR SPECTROSCOPY

Summary for 1CEY

• Entry DOI: 10.2210/pdb1cey/pdb
• Descriptor: CHEY (1 entity in total)
• Functional Keywords: signal transduction
• Biological source: Escherichia coli
• Cellular location: Cytoplasm: P06143
• Total number of polymer chains: 1
• Total formula weight: 13981.14

Authors

Moy, F.J.,Lowry, D.F.,Matsumura, P.,Dahlquist, F.W.,Krywko, J.E.,Domaille, P.J. (deposition date: 1994-11-23, release date: 1995-02-07, Last modification date: 2024-05-22)

Primary citation

Moy, F.J.,Lowry, D.F.,Matsumura, P.,Dahlquist, F.W.,Krywko, J.E.,Domaille, P.J.
Assignments, secondary structure, global fold, and dynamics of chemotaxis Y protein using three- and four-dimensional heteronuclear (13C,15N) NMR spectroscopy.
Biochemistry, 33:10731-10742, 1994

PubMed Abstract: NMR spectroscopy has been used to study recombinant Escherichia coli CheY, a 128-residue protein involved in regulating bacterial chemotaxis. Heteronuclear three- and four-dimensional (3D and 4D) experiments have provided sequence-specific resonance assignments and quantitation of short-, medium-, and long-range distance restraints from nuclear Overhauser enhancement (NOE) intensities. These distance restraints were further supplemented with measurements of three-bond scalar coupling constants to define the local dihedral angles, and with the identification of amide protons undergoing slow solvent exchange from which hydrogen-bonding patterns were identified. The current model structure shows the same global fold of CheY as existing X-ray structures (Volz & Matsumura, 1991; Stock et al. 1993) with a (beta/alpha)5 motif of five parallel beta-strands at the central core surrounded by three alpha-helices on one face and with two on the opposite side. Heteronuclear 15N-1H relaxation experiments are interpreted to show portions of the protein structure in the Mg2+ binding loop are ill-defined because of slow motion (chemical exchange) on the NMR time scale. Moreover, the presence of Mg2+ disrupts the salt bridge between the highly conserved Lys-109 and Asp-57, the site of phosphorylation.

PubMed: 8075074
DOI: 10.1021/bi00201a022

Experimental method

SOLUTION NMR